==Photo:==grout016.jpg
==Description:==Even bathroom sinks have a mistake-proofing device. It is the little hole near the top of the sink that helps prevent overflows.

Categories:

Mistake-proofing category: preventing the influence of mistakes
Setting function: Physical
Regulatory function: Forced Control
Source: Off-the-shelf

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Secondary Problems (side effects, weakness or concerns) with this example:

If the sink has a clog in the drain pipe, the water could start going the overflow tube, only to be blocked by the same obstruction that is blocking the main drain.

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See also:

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